American Music Awards

Taylor Swift accepts the award for favorite female artist - country at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)

Katy Perry performs on stage at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)

Justin Timberlake accepts the award for favorite male artist - pop/rock at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)

Taylor Swift presents the award for favorite male artist - pop/rock at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)

Katy Perry performs on stage at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)

Host Pitbull speaks on stage at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)

Bill Maher, left, and Rihanna's mother Monica Braithwaite, right, present the Icon award to Rihanna on stage at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)

Katy Perry arrives at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by Jordan Strauss/Invision/AP)

Katy Perry arrives at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by Jordan Strauss/Invision/AP)

Taylor Swift accepts the award for artist of the year at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)

Miley Cyrus performs at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)

Miley Cyrus performs at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)

Miley Cyrus performs at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)

Luke Bryan accepts the award for favorite male artist - country at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)

Rihanna poses backstage with the Icon award at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by Jordan Strauss/Invision/AP)

Rihanna poses backstage with the Icon award at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by Jordan Strauss/Invision/AP)

Taylor Swift poses backstage with the awards for favorite album - country for "Red", favorite female artist - pop/rock, favorite female artist - country, and artist of the year at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by Jordan Strauss/Invision/AP)

From right, T-Boz and Chilli of the musical group TLC pose with Lil Mama backstage at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by Jordan Strauss/Invision/AP)

Lil Mama poses backstage at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by Jordan Strauss/Invision/AP)

From left, Mark Cuban, Robert Herjavec, Daymond John and Kevin O'Leary, of Shark Tank, present the award for favorite band, duo or group - pop rock at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)

Lady Gaga performs at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)

R. Kelly, left, and Lady Gaga perform at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)

Lady Gaga, foreground, and R. Kelly perform at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)

From right, Chilli and T-Boz of the musical group TLC perform with Lil Mama on stage at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)

Miley Cyrus performs on stage at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)

Tyler Hubbard, left, and Brian Kelley, right, of the musical group Florida Georgia Line, pose backstage with Nelly and the award for single of the year for "Cruise" at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by Jordan Strauss/Invision/AP)

Ariana Grande poses backstage with the award for new artist of the year at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by Jordan Strauss/Invision/AP)

Jennifer Lopez performs at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)

Maksim Chmerkovskiy, seen standing, performs with Jennifer Lopez at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)

Jennifer Lopez performs at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)

Ke$ha, center, performs at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)

Marc Anthony accepts the award for favorite artist - Latin at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)

Ke$ha, center left, and Pitbull, center right, perform on stage at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)

Lady Gaga arrives at the 2013 American Music Awards, on Sunday, Nov. 24, 2013 in Los Angeles. (Photo by Matt Sayles/Invision/AP)

R Kelly arrives at the 2013 American Music Awards, on Sunday, Nov. 24, 2013 in Los Angeles. (Photo by Matt Sayles/Invision/AP)

Rihanna performs on stage at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)

Justin Timberlake accepts the award for favorite male artist - soul/R&B at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)

Justin Timberlake, center, performs on stage at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)

Macklemore, right, and Ryan Lewis accept the award for favorite album - rap/hip-hop for "The Heist" via satellite from Miami during the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)

Joan Jett, left, and Dave Grohl present the award for favorite artist - alternative rock at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)

Tyler Hubbard, left, and Brian Kelley of the musical group Florida Georgia Line perform on stage at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)

Liam Payne, left, and Harry Styles of the musical group One Direction perform on stage at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)